61 
the caudal is of the latter colour ; anal dark, with the rays purple ; 
ventrals white, with the rays rosy ; pectorals yellow at the base, 
and black on their interior half. Average length, 11 inches, but 
some are much larger. 
MUEEATIA. 
This new genus comes between Dules and Therapon. 
The dorsal has eleven spines ; the operculum is denticulated 
in all its length ; there is a line of small teeth on the palatines, 
and the caudal is rounded. Scales minutely serrated; head 
cavernous. 
These fish inhabit the rivers of Eiverina, and particularly the 
Murray, and are brought to the Melbourne market by the Echuca 
Railway. They are all considered good for the table, and are 
generally sold under the name of Murray Perch. 
This genus must be very nearly allied to Macquaria, but the 
latter has no teeth in the jaws. I expect that the Dules Five'r- 
rinus, Krefft, “ Proceedings Zoological Society, 1867,” which I 
have not seen, belongs to this genus, as it has eleven spines at 
the dorsal ; it also comes from the Murray. 
MUEEATIA &UNTHEEI. 
D 11/12. A. f. P. 16. C. 16. L. lat. 50 (and 5 on the 
Caudal). L. tr. 10^/18^. 
Height three and one-half times in length ; head three and 
two-thirds in same ; eye four and one-half in the length of the head. 
Upper profile very convex, the back being very much elevated 
behind the head, and almost gibbous ; lower profile much more 
regularly curved ; upper surface of the head naked ; the other 
parts covered with scales. Prajorbital very finely denticulated ; 
prseoperculum with its posterior margin rather emarginated, and 
finely serrated ; at its rounded part, these denticulations become 
much larger, and extend so on all the inferior margin. They 
present several small spaces devoid of them — one before the 
angle, one below it, and a few others on the lower edge. Oper- 
culum terminated by two very broad, flat, oblique appendices 
these are strongly serrated, and the space between them is very 
small; all the posterior margin is finely serrated; the super- 
scapula and the caracoid are also serrated. The lateral line is 
